content: /* Copyright 2016 The TensorFlow Authors. All Rights Reserved.
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  
  package org.tensorflow;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotEquals;
  
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Unit tests for {@link Shape}. */
  @RunWith(JUnit4.class)
  public class ShapeTest {
  
    @Test
    public void unknown() {
      assertEquals(-1, Shape.unknown().numDimensions());
      assertEquals("<unknown>", Shape.unknown().toString());
    }
  
    @Test
    public void scalar() {
      assertEquals(0, Shape.scalar().numDimensions());
      assertEquals("[]", Shape.scalar().toString());
    }
  
    @Test
    public void make() {
      Shape s = Shape.make(2);
      assertEquals(1, s.numDimensions());
      assertEquals(2, s.size(0));
      assertEquals("[2]", s.toString());
  
      s = Shape.make(2, 3);
      assertEquals(2, s.numDimensions());
      assertEquals(2, s.size(0));
      assertEquals(3, s.size(1));
      assertEquals("[2, 3]", s.toString());
  
      s = Shape.make(-1, 2, 3);
      assertEquals(3, s.numDimensions());
      assertEquals(-1, s.size(0));
      assertEquals(2, s.size(1));
      assertEquals(3, s.size(2));
      assertEquals("[?, 2, 3]", s.toString());
    }
  
    @Test
    public void nodesInAGraph() {
      try (Graph g = new Graph()) {
        Output<Float> n = TestUtil.placeholder(g, "feed", Float.class);
        assertEquals(-1, n.shape().numDimensions());
  
        n = TestUtil.constant(g, "scalar", 3);
        assertEquals(0, n.shape().numDimensions());
  
        n = TestUtil.constant(g, "vector", new float[2]);
        assertEquals(1, n.shape().numDimensions());
        assertEquals(2, n.shape().size(0));
  
        n = TestUtil.constant(g, "matrix", new float[4][5]);
        assertEquals(2, n.shape().numDimensions());
        assertEquals(4, n.shape().size(0));
        assertEquals(5, n.shape().size(1));
      }
    }
  
    @Test
    public void equalsWorksCorrectly() {
      assertEquals(Shape.scalar(), Shape.scalar());
      assertEquals(Shape.make(1, 2, 3), Shape.make(1, 2, 3));
  
      assertNotEquals(Shape.make(1, 2), null);
      assertNotEquals(Shape.make(1, 2), new Object());
      assertNotEquals(Shape.make(1, 2, 3), Shape.make(1, 2, 4));
  
      assertNotEquals(Shape.unknown(), Shape.unknown());
      assertNotEquals(Shape.make(-1), Shape.make(-1));
      assertNotEquals(Shape.make(1, -1, 3), Shape.make(1, -1, 3));
    }
  
    @Test
    public void hashCodeIsAsExpected() {
      assertEquals(Shape.make(1, 2, 3, 4).hashCode(), Shape.make(1, 2, 3, 4).hashCode());
      assertEquals(Shape.scalar().hashCode(), Shape.scalar().hashCode());
      assertEquals(Shape.unknown().hashCode(), Shape.unknown().hashCode());
  
      assertNotEquals(Shape.make(1, 2).hashCode(), Shape.make(1, 3).hashCode());
    }
  }
  